anterior end of Echinostoma revolutum, revealing the crown of spines surrounding the mouth, as well as the
muscular pharynx leading to the branched caeca. The acetabulum (paler) and
genital pore (darker) are framed by the branches of the caeca. 40x
higher magnification, 100x, of the crown of spines of E. revolutum but also revealing the spiny
tegument. Note the muscular pharynx.